Valve grinder



Aug. 8, 1939. F, T. swEIGART VALVE GR INDER Original Filed March 7, 1936INVENTOR. Manl'rfezyar, BY

gf; )Ma/vw@ 15K/y ATTORNEYS Patented Aug 8L, 1939 UNITED STATES PATENTOFFICE vApplication March 7,

1936, Serial No. 67,574

Renewed January 7, 1939 3 Claims.

This invention relates to a device for grinding valves and valve seatsoi motors and other machines in situ and is characterized by simplicity,cheapness and convenience in use. So far as is known no grinding deviceor the like has been heretofore provided which might be applied tovalves without either removing' the valves or at least changing thenormal assembly of parts.

The principal object of the invention is to provide a device by whichvalves and valve seats might be ground without removing the valve ordisturbing the normal relationship of associated elements. A furtherobject of the invention is to provide a device for the purpose indicatedwhich has a grinding element that may be readily slipped into operativerelation to the valve or valve seat to be groundwhen the valve iselevated from its seat by its operating mechanism. A further object ofthe invention is to associate with the aforesaid grinding elements meansby which it may be rotated to accomplish its grinding function. Stillanother object of the invention is to provide simple means forconnecting and disconnecting the grinding element from the means b ywhich it is rotated. A further object of the invention is to provide agrinding element which may have on its faces a suitable abrasivematerial whereby upon rotation of the grinding element a valve and itsseat may be ground simultaneously. Still another object of the inventionis to provide a simple element for the purpose set forth whose shape andsize may adapt it for grinding the particular valve and seat with whichit is to be used.

In accordance with the invention the grinding element no matter whatshape is so formed as to permit it to be slipped under the valve to beground, a central opening being provided to r-eceive the valve stem.With a grinding element or suitable form and dimensions thus placedbetween the valve and its seat a second element is placed over the valveand engaged with the grinding element, such second element beingoperatively connected to a suitable source of power by means of whichthe grindingelement may be rotated to grind the valve in situ and, ifdesired, the valve seat.

These and other objects and advantages will appear more fullyhereinafter in connection with the description of the form of the deviceillustrated in the drawing by way of example and in which:

Figure 1 is a View in vertical section of a fragment of a motor showinga conventional valve with its operating cam and the relation thereto f iof the improved device with the valve raised.

Figure 2 is a View similar to Figure 1 with the valve lower-ed onto thegrinding element and the power transmission element engaged therewith.

Figure 3 is a view in plan of onel form of power transmission element.

Figure 4 is a view in transverse section through the member shown inFigure 3 and taken on the plane indicated by the line 4--4 and lookingin the direction of the arrows.

Figure 5 is a View in side elevation of one section of a grindingelement where the latter is of sectional rather than unitary form.

Figure 6 is a View in plan of the type of grinding element shown inFigure 5.

Figure l is a view in section showing a unitary grinding element inoperative relation to a valve and its seat.

For the purposes of this description there is illustrated at a a valvehaving a tapered seat b in the engine block c. The valve is reciprocatedin the usual manner by a cam d against the action oi a valve spring ewhich is operatively engaged with the valve stem a', all in accordancewith established practice. When the cam d is in the position illustratedin Figure l the valve a is lifted from its seat to a maximum extent. Theclearance is such as to permit the insertion of the improved grindingelement f. This element in the form illustrated is so shaped in crosssection as to insure intimate engagement of its under face with thevalve seat b and of its upper face with the Working portion of the valvea. In cross section, accordingly, the grinding element is generally inthe form of a concave disk. Centrally of the grinding element is anopening j'. In this embodiment the grinding elem-ent is sectionalcomprising a plurality of segments f4, f5, shown as two in number. By avery simple manipulation `each segment of the grinding disk can be slidinto place under the valve a when the latter is raised from its seat asin Figure 1, the central opening f in the assembled disk receiving thevalve stem a with the disk disposed coaXially with relation to the valvestem. On one or Vboth faces of the segments of the grinding element isan abrasive surface. preferably constituted by sheets of abrasivematerial g, g',` attached in such manner as to be removable forreplacement when and as required.

' When the cam d is in the position indicated in Figure 2 or out ofcontact with the lifter they spring e is effective to urge the workingsurface of the valve a into engagement with the abrasive surface of thedisk f and, in turn, the under surface of the disk into engagement withthe valve seat b. In accordance with the invention it will thus be seenthat the grinding element is inserted readily into proper workingrelation to the valve and to its' seat without removing the valve orchanging the normal relationship of its associated parts. Means areprovided for rotating the grinding element to accomplish its intendedpurpose. Such means may obviously take different forms. That illustratedin the preferred embodiment has the virtue of simplicity and cheapness.As shown in Figure the grinding element is formed with a plurality ofradially extending lugs f3 at its periphery. A transmission element hshown in Figure 4 is provided as a dished generally obverse to thegrinding element. The transmission Ielement h has a plurality ofradially extending lugs h which are adapted to rest between adjoininglugs f3 of the segments of the grinding disk. The transmission disk h isshown in its operative relation to the grinding disk in Figure 2 whereit rests over the valve a with its lugs h operatively engaged with thelugs f3 of the grinding element. The transmission element h is connectedoperatively through a spindle i or otherwise to any suitable source ofpower. For convenience, this spindle may have a circular flange z" and asquared section i2 adjacent its lower end which is received by asimilarly formed hub h2 on the transmission Velement h. A set screw h3may be employed to secure the transmission elementrto the spindle i aswill be apparent. The lower end of the spindle may be tapered as at i3to constitute a centering bearing engageable with the recess a2 on theaxis of the valve.

In operation, it will be apparent that upon application of power throughthe spindle i or an equivalent connection the transmission element h isrotated and with it the grinding element f. The abrasive material gwhich is in intimate engagement with the working surface of the valve a.grinds the latter and if the abrasive material g is applied to the undersurface of the disk f the valve seat b is simultaneously ground. Theparts are held in proper centered relation by the engagement of thespindle i3 with the valve a. When the grinding operation is completedthe transmission disk h is lifted away from its engagement with thegrinding element. The valve is elevated by means of the cam d and thesegments of the grinding unit removed.

As shown in Figure 7 the grinding element is readily adapted to anydesired form and dimensions depending on the unit to be ground. In thisfigure is illustrated a valve k having a flat seat Z. Accordingly, thegrinding unit m is formed generally as a circular disk with a centrallydepressed portion but it need have such a degree of concavity as isshown in Figure 1, where the valve seat and valve are tapered. Agrinding surface is interposed between the seat Z and the at workingsurface of the valve. Such grinding surface is accordingly disposedparallel to the face of the seat and the surface of the valve to beground. In vthis form the grinding element is of unitary structure andhas a radially extending slot m therein to permit the insertion of thegrinding unit between the valve and its seat with the valve stem lcdisposed substantially concentrically therewith. The same benefits areobtained in that when the valve is raised from its seat the grindingunit can be slipped in readily between the Valve and its seat and theabrasive material will be in proper operative relation to the surfacesto be ground. The valve will be urged against the abrasive surface bythe Valve spring and in both embodiments the tension of the spring canbe adjusted if that is found necessary or desirable.

In this gure there is shown by way of example a practical way ofsecuring grinding material to such a grinding element. One sheet ofgrinding material is indicated at n on the upper surface of the grindingelement and another grinding sheet is indicated at n' on the undersurface of the grinding element. These sheets may be circular conformingto the outline of the grinding element and secured in place by upper andlower retaining ribs o, p, respectively, which engage the grindingsheets and are secured together by removable screws q.

In this embodiment as in the one previously described the powertransmitter 1' is engageable operatively with the grinding element m.

Changes in form, dimensions and details of construction will suggestthemselves to those skilled in the art but all such modifications are tobe deemed within the scope of the invention so long as there is retainedthe principle of applying the grinding element to a valve or the likewithout removing the latter.

What I claim is:

1. A device for simultaneously grinding valves mounted upon valve stemsand their associated valve seats and adapted to be used without removingthe valve comprising a dished grinding unit having opposed grindingsurfaces and an opening therein to receive the valve stem, said grindingunit being formed with a slot extending between the opening and theperiphery of the unit to permit the insertion of the unit between thevalve and Valve seat whereby the valve and valve seat may be ground in asingle operation.

2. A device for simultaneously grinding valves mounted upon valve stemsand their associated valve seats and adapted to be used without removingthe valve comprising a dished grinding unit having opposed grindingsurfaces and an opening therein to receive the valve stem, said grindingunit being formed with peripheral lugs and a slot extending between theopening and the periphery of the unit to permit the insertion of theunit between the valve and valve seat whereby the valve and valve seatmay be ground in a single operation, and means formed with peripherallugs to engage the first named lugs to rotate the grinding unit.

3. A device for simultaneously grinding valves mounted upon valve stemsand their associated valve seats, comprising a dished grinding unithaving opposed grinding surfaces and an opening therein to receive thevalve stern, said device being so slotted that it may be applied to thevalve and valve seat without removal of the valve from its supportingstructure.

FRANK T. SWEIGART.

